1.process :Butt-welded&Overlap 2.cold or hot water,gas series 3.ISO,CE,AENOR, EMI certificate 4.high quality,favourable ... heating installation on floor andwall, snow-melting devices for buildings in northern, park, airport,and so on;3. Pipe used for ... . Pipe/tube used for oxygen input in hospital;10. Pipes used for irrigation project in agriculture or garden;11. Pipes used for gas ...